Reasons For

The LG 55UF6800 has an RMS rated power of 20WW, but the VIZIO M55-C2 is only a 15WW RMS rated power TV (5W lower).
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RMS rated power stands for Root Mean Square rated power and it is typically used to measure the power output of the audio element of the TV.

A higher RMS rated power means that the audio system on the TV is more powerful and will be able to play the audio at higher volumes. A higher RMS power may also result in better quality audio at normal volume levels.

Thinner
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LG 55UF6800 is 56.7mmmm thick, but the VIZIO M55-C2 is a 63.75mmmm thick TV (7.05mm thicker).
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The depth of the TV is the thickness of the TV measured from the back of the TV to the front of the TV. Curved TVs will have quite a big depth as this dimension is measured from the back of the centre of the screen to the front of the edges of the screen.

A thinner TV has the advantage of appearing more elegant and will also mean that the TV will not stick out as much when mounted on a wall.

Lighter
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The LG 55UF6800 is a 17.8kgg heavy TV. That's 0.099999999999998g lighter than the VIZIO M55-C2 (17.9kgg).
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The weight is the total weight of the TV excluding all packaging.

A lighter weight TV will be easier to move around and to mount on a wall. Some of the larger, very heavy TVs may require lightweight partition walls to be reinforced before the TV could be mounted.

3 Reasons For

Five HDMI ports
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The VIZIO M55-C2 is a five HDMI port TV, whereas the LG 55UF6800 only has two HDMI ports.
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The HDMI ports quantity is the number of ports that the TV has that will accept a HDMI cable. HDMI is the most common type of cable used to connect modern TVs, DVD players, games consoles etc.

A greater number of HDMI ports will allow you to permanently connect more devices to the TV and will reduce the need to reach around the back of the TV to unplug and plug in cables when switching between devices.

Cheaper by $17

The VIZIO M55-C2 is $16.97 cheaper than the LG 55UF6800.

6 shops are selling it

A greater number of sellers increases the price competition amongst retailers for the product and also increases the chances of this TV remaining in stock.

Reasons Against

4 Reasons Against

Three less HDMI ports
Edit

The LG 55UF6800 has two HDMI ports, however the VIZIO M55-C2 only has five HDMI ports.
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The HDMI ports quantity is the number of ports that the TV has that will accept a HDMI cable. HDMI is the most common type of cable used to connect modern TVs, DVD players, games consoles etc.

A greater number of HDMI ports will allow you to permanently connect more devices to the TV and will reduce the need to reach around the back of the TV to unplug and plug in cables when switching between devices.

Smaller numbers of stores reduces the price competition amongst retailers for this TV and also reduces the chances of the product remaining in stock.

One month older

The LG 55UF6800 is older than the VIZIO M55-C2 by one month.

3 Reasons Against

34% lower RMS rated power
Edit

The VIZIO M55-C2 is a 15WW RMS rated power TV. That's 5W lower than the LG 55UF6800 (15WW).
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RMS rated power stands for Root Mean Square rated power and it is typically used to measure the power output of the audio element of the TV.

A higher RMS rated power means that the audio system on the TV is more powerful and will be able to play the audio at higher volumes. A higher RMS power may also result in better quality audio at normal volume levels.

12% thicker
Edit

The VIZIO M55-C2 has a thickness of 63.75mmmm. That's 7.05mm thicker than the LG 55UF6800 (63.75mmmm).
Read more

The depth of the TV is the thickness of the TV measured from the back of the TV to the front of the TV. Curved TVs will have quite a big depth as this dimension is measured from the back of the centre of the screen to the front of the edges of the screen.

A thinner TV has the advantage of appearing more elegant and will also mean that the TV will not stick out as much when mounted on a wall.

A bit heavier
Edit

VIZIO M55-C2 is 17.9kgg heavy, but the LG 55UF6800 is a 17.8kgg heavy TV (0.099999999999998g lighter).
Read more

The weight is the total weight of the TV excluding all packaging.

A lighter weight TV will be easier to move around and to mount on a wall. Some of the larger, very heavy TVs may require lightweight partition walls to be reinforced before the TV could be mounted.